In ToroDB (https://github.com/torodb/torodb https://github.com/torodb/torodb) we are currently working on implementing MongoDB's oplog server-side. ToroDB would

In ToroDB (https://github.com/torodb/torodb https://github.com/torodb/torodb) we are currently working on implementing MongoDB's oplog server-side. ToroDB would work seamlessly with Meteor, meaning that at the end of the day your data sits on a PostgreSQL database. Watch out our next coming release! :)